Polycom VVX 1500 Business Media Phone - Manual (Page 163)

Safety Notices
Polycom, Inc. Safety Notices - 157
New Zealand Telepermit
PTC General Warning
The grant of a Telepermit for any item of terminal equipment indicates only that Telecom has accepted that the item
complies with minimum conditions for connection to its network. It indicates no endorsement of the product by
Telecom, nor does it provide any sort of warranty. Above all, it provides no assurance that any item will work
correctly in all respects with another item of Telepermitted equipment of a different make or model, nor does it imply
that any product is compatible with all of Telecom’s network services.
The Use of IP Networks through the PSTN
Internet Protocol (IP) by its nature introduces delay into speech signals as each data packet is formulated and
addressed. Telecom Access Standards recommends that suppliers, designers and installers using this technology
for calls to or from the PSTN refer to ITU E Model requirements in the design of their networks. The overall aim is to
minimise delay, distortion and other transmission impairments, particularly for those calls involving cellular and
international networks, which already suffer extensive delay.
Echo cancellation
Echo cancellers are not normally required in the Telecom PSTN because geographic delays are acceptable where
CPE return loss is maintained within Telepermit limits. However, those private networks making use of
Voice over IP technology are required to provide echo cancellation for all voice calls. The combined effect of
audio / VoIP conversion delay and IP routing delay can cause the echo cancellation time of 64 mS to be required.
Connection of this Polycom VVX 1500 VoIP Video Telephone to the Telecom network
All samples of this Polycom VVX 1500 VoIP Video Telephone connected to the Telecom network must be modified
as described in KTL Test Report number 8A1710ANZ1 failure to do so will lead to the cancellation of this
Telepermit.
UAE
TRA Registered No: 0017802/09
Dealer No: 0017133/09
Safety and Compliance (continued)